Subscribing to FPS Event Notifications

FPS offers an event notification mechanism that allows your
application to receive notification messages directly from FPS when
something of interest occurs in the service. The service sends the
notifications as SOAP messages to your application, which can interpret
and act on the information in the message. You can register for two
kinds of event notifications.

Transaction Results

When your application performs an asynchronous transaction
operation that cannot be completed immediately, FPS sends a
response message indicating that the transaction has been
initiated. By default, is the responsibility of your application
to use the GetResults operation to poll FPS for status updates to
find out when the transaction is completed. This polling approach
is described in Handling Transaction Results” in
Chapter 11.

If you register for transaction result notifications, FPS
will contact your application directly to notify it when the
status of your transaction changes. This means that your
application will no longer be obliged to poll the service for
transaction status updates; instead, it can sit back and wait for
the event notification messages to arrive from FPS.

Note

You must choose between monitoring transaction status
changes through notifications or through polling: you cannot do
both. If you subscribe to receive transaction result
notification messages, the GetResults operation will no longer
return transaction results.

Token cancellation

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